JP2019014223A - Three-dimensional printing apparatus and three-dimensional printing method - Google Patents

Abstract

To provide 3D printing method applied to a 3D printing apparatus.SOLUTION: The 3D printing apparatus is configured to edit a plurality of slice images and perform a 3D printing operation according to the edited slice image. The 3D printing method analyzes a plurality of slice objects of the slice image and draws a plurality of slice object coatings according to the individual contour of the slice object, and this slice object covering respectively includes a part of the slice object and erases the other part of the slice object outside the slice object covering respectively and integrates the slice object covering of the slice image to obtain the 3D model covering. A 3D printing apparatus to which a 3D printing method is applied is also provided.SELECTED DRAWING: Figure 8

Description

  The present invention relates to three-dimensional (3D) printing technology, and more particularly to a 3D printing apparatus and a 3D printing method.

With the advancement of computer-aided manufacturing (CAM), the manufacturing industry has developed three-dimensional (3D) printing technology, which can quickly produce original design concepts. 3D printing technology is actually the general name for continuous rapid prototyping (RP) technology, the basic principle of which is additive manufacturing on a printing platform, for the object sliced using RP equipment. A plurality of layers are formed in the XY plane on the printing platform through scanning, and the sliced objects are stacked to form a 3D object.
Current 3D printing technology has been applied to special printing applications such as aircraft parts and human skeletons. However, an existing method for hollowing out the 3D model discriminates a region that can be hollow in the 3D model and a region that is not so in the three-dimensional model by discriminating the structural relationship of a plurality of triangular meshes in the 3D model. However, the existing hollowing method has a problem that the inner 3D contour of the coating of the 3D model has a non-smooth surface, and the thickness of the coating cannot be substantially adjusted. Accordingly, how to print a 3D model having a hollow structure has been one of the most important issues in this technical field.

  The present invention relates to a 3D printing apparatus and a 3D printing method in which a smooth 3D model coating is obtained and a printing operation is performed on the 3D model coating to print a high-quality 3D object having a hollow structure.

  The present invention provides a 3D printing method applied to a 3D printing apparatus. The 3D printing apparatus is configured to slice a 3D model in a horizontal direction to obtain a plurality of slice images, edit the slice image, and perform a 3D printing operation according to the edited slice image. The 3D printing method analyzes a plurality of slice objects of the slice image, draws a plurality of slice object covers according to each outline of the slice object, and each of the slice object covers is obtained from a part of the slice object. Configured, erasing other portions of the slice object outside the slice object coverage, and integrating the slice object coverage of the slice image to obtain a 3D model coverage.

  In one embodiment of the invention, the slice object covers each have the same predetermined thickness.

  In one embodiment of the present invention, the outer 3D contour of the 3D model covering is further analyzed to obtain a plurality of slice numbers corresponding to a plurality of coordinate positions of the outer 3D contour on a reference plane, and the coordinates Based on the number of slices corresponding to the position, the distance of the 3D model coverage from the outer 3D contour to the inner 3D contour is determined in the vertical direction, and the slice object coverage of the slice image is changed.

  In one embodiment of the present invention, the step of determining the distance of the 3D model covering from the outer 3D contour to the inner 3D contour in the vertical direction based on the number of slices corresponding to the coordinate position, Determining a printing region of the 3D model coating according to a predetermined number of layers, and changing the inner 3D contour of the 3D model coating.

  In one embodiment of the invention, analyzing the slice object of the slice image and drawing the slice object covering according to the individual contour of the slice object comprises: Drawing a plurality of reference contours along each outer side and drawing the slice object covering along the inner side of each of the reference contours.

  In one embodiment of the present invention, the contour is an outer layer contour or a hollow contour.

  In an embodiment of the present invention, the 3D printing method further draws a support structure in a region surrounded by the slice object covering.

  The present invention provides a 3D printing apparatus including a 3D printing unit, a processing unit, and a storage unit. The processing unit is connected to the 3D printing unit. The processing unit is configured to slice a 3D model in a horizontal direction to obtain a plurality of slice images and to edit the slice image. The processing unit operates the 3D printing unit to perform a 3D printing operation according to the edited slice image. The storage unit is connected to the processing unit. The storage unit is configured to store the 3D model and a plurality of modules. The processing unit executes the module and performs the following operations. A plurality of slice objects of the slice image are analyzed, and a plurality of slice object covers are drawn according to respective outlines of the slice objects, and each of the slice object covers is composed of a part of the slice object, and the slice object Each other part of the slice object outside the covering is erased and the slice object covering of the slice image is integrated to obtain a 3D model covering.

  In one embodiment of the invention, the slice object covers each have the same predetermined thickness.

  In one embodiment of the present invention, the processing unit executes the module and performs the following operation. Analyzing the outer 3D contour of the 3D model cover to obtain a plurality of slice numbers corresponding to a plurality of coordinate positions of the outer 3D contour on a reference plane, and based on the number of slices corresponding to the coordinate position, In the direction, the distance of the 3D model coverage from the outer 3D contour to the inner 3D contour is determined, and the slice object coverage of the slice image is changed.

  In one embodiment of the present invention, the operation of determining the distance of the 3D model covering from the outer 3D contour to the inner 3D contour in the vertical direction based on the number of slices corresponding to the coordinate position, Determining a printing region of the 3D model coating according to a predetermined number of layers, and changing the inner 3D contour of the 3D model coating.

  In an embodiment of the present invention, the operation of analyzing the slice object of the slice image and drawing the slice object cover according to the individual contour of the slice object comprises: Drawing a plurality of reference contours along each outer side and drawing the slice object covering along the inner side of each of the reference contours.

  In one embodiment of the present invention, the contour is an outer layer contour or a hollow contour.

  In one embodiment of the present invention, the processing unit executes the module and further draws a support structure in a region surrounded by the slice object covering.

  As described above, the 3D printing apparatus and the 3D printing method of the present invention obtain a 3D model coating by smoothly hollowing the 3D model, change the thickness of the 3D model coating along the horizontal direction and the vertical direction, respectively. Applied to reducing the imbalance of the inner 3D contour of the model. Therefore, the 3D printing apparatus and 3D printing method of the present invention are applied to printing 3D objects with a high-quality hollow effect.

  In order to make the aforementioned and other features and advantages of the present invention easier to understand, a number of exemplary embodiments are described in detail below with reference to the accompanying drawings.

  The accompanying drawings are included to provide a further understanding of the invention, and constitute a part of this specification. The drawings illustrate embodiments of the present invention, and together with the following description, explain the principles of the invention.

1 is a schematic diagram of a three-dimensional (3D) printing apparatus according to an embodiment of the present invention.

It is the schematic which edits a slice image based on embodiment of this invention.

It is the schematic which edits a slice image based on another embodiment of this invention.

It is the schematic of the 3D model which concerns on embodiment of this invention.

It is the schematic of the slice number matrix of embodiment shown in FIG.

FIG. 5 is a side view of the 3D model according to the embodiment shown in FIG. 4.

FIG. 5 is a schematic diagram for editing a slice image according to the embodiment shown in FIG. 4.

It is the schematic which edits another slice image based on Embodiment shown in FIG.

It is the schematic which edits another slice image based on embodiment shown in FIG.

It is a flowchart which shows the 3D printing method which concerns on embodiment of this invention.

  Reference will now be made to the following preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the following description to refer to the same or like elements.

  FIG. 1 is a schematic diagram of a three-dimensional (3D) printing apparatus according to an embodiment of the present invention. Referring to FIG. 1, the 3D printing apparatus 100 includes a processing unit 110, a 3D printing unit 120, and a storage unit 130. The processing unit 110 is connected to the 3D printing unit 120 and the storage unit 130. In the present embodiment, the processing unit 110 is configured to control the 3D printing unit 120 to perform a 3D printing operation. In the present embodiment, the 3D printing unit 120 includes, for example, a printing head, a printing platform, and a drive unit. For example, the printing head melts the forming material and supplies the dissolved forming material onto the printing platform to perform a 3D printing operation. In addition, the 3D printing unit 120 may perform other 3D printing components, such as a control unit, a heating module, a material supply pipe, a printing unit, and the like, which are used in conjunction with the printing head, the printing platform, and the driving unit to perform a 3D printing operation. A head linkage mechanism, etc.), and sufficient instructions and advice for relevant components can be obtained from ordinary knowledge in the art and the detailed description thereof will not be repeated.

  In the present embodiment, the processing unit 110 is, for example, a processing chip, an image processing chip or a central processing unit (CPU), or other general-purpose or dedicated microprocessor, digital signal processor (DSP), programmable controller, and application-specific integration. A circuit (ASIC), a programmable logic device (PLD), other similar processing circuit, or a combination thereof.

  In the present embodiment, in the 3D printing operation, the 3D printing unit 120 controls the movement path of the printing head according to a plurality of slice images of the 3D model, and controls the printing head to print the slice object on the conveyance surface of the printing platform. This slice image is, for example, a two-dimensional (2D) image file. In the present embodiment, the 3D printing unit 120 continuously prints a plurality of layers of slice objects and stacks the slice objects to form a three-dimensional object on the transport surface of the printing platform. In the present embodiment, the processing unit 110 may read the 3D image file and show the 3D model in the editing interface. The 3D model is formed by a computer host using, for example, computer-aided design (CAD) or animation modeling software.

  In the present embodiment, the storage unit 130 is, for example, a dynamic random access memory (DRAM), a flash memory, or a nonvolatile random access memory (NVRAM). The storage unit 130 is configured to store the module and data according to the embodiment of the present invention, and the processing unit 110 reads or executes the module and data to perform the model editing operation or the data according to the embodiment of the present invention. Perform 3D printing operations. Moreover, although the module which concerns on embodiment of this invention is performed in the aspect of a software or a hardware circuit, this invention is not limited to these.

  FIG. 2 is a schematic diagram for editing a slice image according to the embodiment of the present invention. 1 and 2, in the present embodiment, the processing unit 110 is configured to slice a 3D model horizontally, obtain a plurality of slice images, and edit the slice images. Taking one slice image as an example, in the present embodiment, the processing unit 110 analyzes the slice object of the initial slice image 200a and draws a slice object covering corresponding to the outline 210 of the slice object. A region surrounded by the outline 210 is a slice object (hatched region). More specifically, first, the processing unit 110 draws the reference outline 220 along the outside of the outline 210 of the slice object. As shown by the slice image 200b, a portion surrounded by the contour 210 and the reference contour 220 is a reference region. Next, the processing unit 110 draws another reference contour 230 along the inside of the reference region. As indicated by the slice image 200c, the processing unit 110 sets a region surrounded by the contour 210 and the reference contour 230 as a slice object coverage, and the slice object coverage includes a part of the slice object. Next, the processing unit 110 deletes other portions of the slice object outside the slice object cover. As shown by the slice image 200d, the slice object covering may have equidistant wall thicknesses. That is, the 3D printing apparatus 100 according to the present embodiment can acquire a smooth slice object covering. The outer side and the inner side in the present embodiment relate to a slice object. In the present embodiment, the inner side is a side including the main body of the slice object, and the outer side is another side not including the main body of the slice object.

  In one embodiment, the processing unit 100 further edits the slice object cover. As shown by the slice image 200e, the processing unit 100 may draw the support structure 240 in the region surrounded by the slice object, and the 3D object printed by the 3D printing unit 120 has sufficient support and good robustness. Can have. However, the support structure 240 of the present invention is not limited to the configuration shown by the slice image 200e of FIG. 2, and the support structure 240 may be determined according to different printing requirements or three-dimensional object types. It is not limited by. Also, the slice images 200a to 200e of the present embodiment are used only to show slice image editing processing, and the shape of the slice object of the present invention is limited to the shape shown by the slice images 200a to 200e shown in FIG. Not.

  FIG. 3 is a schematic diagram for editing a slice image according to another embodiment of the present invention. 1 and 3, in the present embodiment, the slice object of the initial slice image 300a may have a contour. As shown by the slice image 300a, the slice object is an area surrounded by the contour 310 and the contour 340. In the present embodiment, the contour 310 is the outer contour of the slice object, and the contour 340 is the contour of the hole of the slice object. In the present embodiment, the processing unit 110 may obtain the reference contour 320 and the reference contour 330 by performing the editing method of the embodiment of FIG. 2 on the slice object having the outer contour and the hole contour. . As shown by the slice image 300b, the processing unit 110 sets the region surrounded by the contour 310 and the reference contour 320 as the slice object covering, and the region surrounded by the contour 340 and the reference contour 330 is set as another slice. You may set as object covering. In addition, the processing unit 110 according to the present embodiment further draws a support structure in a region surrounded by two slice object covers (for example, a region between the reference contour 320 and the reference contour 330), and the 3D printing apparatus 3D objects printed by 120 may have sufficient support and good robustness.

  However, for those skilled in the art, sufficient instructions and advice can be obtained from the description of the embodiment shown in FIG. 2 for the slice object analysis method and slice image editing method in the present embodiment. Do not repeat.

  FIG. 4 is a schematic diagram of a 3D model according to the embodiment of the present invention. Referring to FIGS. 1 and 4, in the present embodiment, the processing unit 110 integrates a plurality of slice images having the slice object coverage drawn according to the embodiment shown in FIG. 2 to obtain a 3D model coverage 400. . In the present embodiment, the 3D model covering 400 is located in a 3D space formed by the coordinate axis X, the coordinate axis Y, and the coordinate axis Z, for example. Further, the 3D model covering 400 may be formed by stacking a plurality of slice object coverings of a plurality of slice images from the reference plane S1 along the coordinate axis Z. The reference plane S1 is a plane formed by the coordinate axis X and the coordinate axis Y, and the reference plane S1 is, for example, a transport surface of the printing platform. The 3D model covering 400 may comprise an outer 3D contour 410 and an inner 3D contour 420. In the present embodiment, the processing unit 110 may change the wall thickness of the 3D model coating 400 in the vertical direction, which will be described below with reference to FIGS.

  FIG. 5 is a schematic diagram of the slice number matrix of the embodiment shown in FIG. In the present embodiment, the processing unit 110 analyzes the outer 3D contour 410 of the 3D model cover 400 and acquires a plurality of slice numbers corresponding to a plurality of coordinate positions of the outer 3D contour 410 on the reference plane S1. As shown by the slice number matrix in FIG. 5, in the present embodiment, the slice number matrix is, for example, an 11 × 11 matrix. The slice number matrix may include a plurality of slice number information respectively corresponding to the coordinates (0, 0) to the coordinates (x, y). Also, the slice number information of the slice number matrix may correspond to the number of slices at a plurality of highest point positions of the outer 3D contour 410 of the 3D model covering 400, respectively.

  More specifically, in the present embodiment, the 3D model cover 400 is formed by stacking, for example, 99 layers of slice images, and the highest point position of the 3D model cover 400 is 99 layers of the slice object cover. Is the thickness. As estimated by analogy, the highest point positions corresponding to other coordinate positions of the 3D model cover 400 can each be formed by stacking different numbers of slice object covers.

  FIG. 6 is a side view of the 3D model according to the embodiment shown in FIG. In the present embodiment, the processing unit 110 generates a 3D model from the outer 3D contour 410 to the inner 3D contour 420 in the vertical direction based on the plurality of slice numbers corresponding to the plurality of coordinate positions of the slice number matrix shown in FIG. The distance of the covering 400 may be obtained and changed to a plurality of slice object coverings of a plurality of slice images. Taking the slice images 401, 402, and 403 as examples, the slice images 401, 402, and 403 are at different slice positions of the 3D model covering 400, respectively. In the present embodiment, the processing unit 110 obtains the 3D reference contour 430 of the 3D model cover 400 according to the predetermined distance h, and the number of slices is adopted as one unit of the predetermined distance h. That is, the processing unit 110 applies the 3D model coating as a printing region between the outer 3D contour 410 and the 3D reference contour 430 so that the 3D model coating 400 has the same distance h in the vertical direction (the direction of the coordinate axis Z). And a 3D model covering may be set as a non-printing region between the 3D reference contour 430 and the inner 3D contour 420. That is, the 3D printing apparatus 120 does not perform the 3D printing operation on the 3D model covering between the 3D reference contour 430 and the inner 3D contour 420.

  Referring to FIGS. 7A to 7C for a specific method of editing a slice image, FIGS. 7A to 7C are schematic diagrams of editing of a slice image according to the embodiment shown in FIG. In the following embodiment, it is assumed that the predetermined distance h is the thickness of the slice object in which five layers of the slice image are stacked, but the present invention is not limited to this.

  In the present embodiment, the slice image 401 in FIG. 7A is the 88th slice image of the 3D model covering 400, for example. In the present embodiment, the area (hatched area) surrounded by the outline 410a corresponding to the outer 3D outline 410 is a slice object covering. The processing unit 110 determines whether an area corresponding to each coordinate position of the slice object covering in the slice image 401 is a printing area or a non-printing area. That is, the number of slices (88) corresponding to a part of the slice object covering of the slice image 401 at each coordinate position is within the region from the corresponding number of slices at the highest point position in the slice number matrix to a predetermined distance h. If not, this portion of the slice object coverage is determined to be a non-printing region. For example, the number of slices at the highest point position of the 3D model cover 400 at the coordinate position (6, 6) is 99, but the number of slices of the slice object cover of the slice image 401 at the coordinate position (6, 6) is 88 ( 88 <99-5). Therefore, the processing unit 110 determines that the slice object covering of the slice image 401 at the coordinate position (6, 6) is a non-printing area. As can be estimated by analogy, the coordinate positions (5, 5), (6, 5), (7, 5), (5, 6), (7, 6), (5, 7), (6, 7 ), The slice object coverage of the slice image 401 in (7, 7) is also a non-printing area (88 <97-5). Further, another coordinate axis position of the slice object covering of the slice image 401 having the number of slices of 93 or less at the highest point position is a printing area (for example, 88 ≧ 93−5). Accordingly, as indicated by the slice image 401, the processing unit 110 sets a region (hatched region) surrounded by the contour 410a to the contour 430a as a printing region, and a region (non-hatched region) surrounded by the contour 430a. To the non-printing area.

  In the present embodiment, the slice image 402 in FIG. 7B is a slice image of the 83rd layer of the 3D model covering 400, for example. In the present embodiment, the region surrounded by the contour 410b corresponding to the outer 3D contour 410 and the contour 420b corresponding to the inner 3D contour 420 is a slice object covering. The processing unit 110 determines whether an area corresponding to each coordinate position of the slice object covering in the slice image 402 is a printing area or a non-printing area. In other words, the number of slices (83) corresponding to a part of the slice object covering of the slice image 402 at each coordinate position is an area from the number of slices corresponding to the corresponding highest point position in the slice number matrix to a predetermined distance h. If not, this portion of the slice object coverage is determined to be a non-printing region. For example, the coordinate positions (4, 4), (5, 4), (6, 4), (7, 4), (8, 4), (4, 5), (8, 5), (4, 6 ), (8, 6), (4, 7), (8, 7), (4, 8), (5, 8), (6, 8), (7, 8), (8, 8) The number of slices at the highest point position of the 3D model cover 400 is 90, but the number of slices of the slice object cover of the slice image 402 at these coordinate positions is 83 (83 <90-5). Therefore, the processing unit 110 determines that the slice object covering of the slice image 402 at these coordinate positions is a non-printing area. As can be estimated by analogy, the other coordinate axis position of the slice object covering of the slice image 402 having the number of slices of 88 or less at the highest point position is a printing area (for example, 83 ≧ 88-5). Therefore, as shown by the slice image 402, the processing unit 110 sets a region surrounded by the contour 410b to the contour 430b (hatched region) as a printing region, and a region surrounded by the contour 420b to the contour 420b (non-hatched line). Area) is set as a non-printing area.

  In the present embodiment, the slice image 403 in FIG. 7C is, for example, the 72nd slice image of the 3D model covering 400. In the present embodiment, the region surrounded by the contour 410c corresponding to the outer 3D contour 410 and the contour 420c corresponding to the inner 3D contour 420 is a slice object covering. The processing unit 110 determines whether an area corresponding to each coordinate position of the slice object covering in the slice image 403 is a printing area or a non-printing area. That is, the number of slices (72) corresponding to a part of the slice object covering of the slice image 403 at each coordinate position is within the region from the corresponding number of slices at the highest point position in the slice number matrix to a predetermined distance h. If not, this portion of the slice object coverage is determined to be a non-printing region. For example, the coordinate positions (3, 3), (4, 3), (5, 3), (6, 3), (7, 3), (8, 3), (9, 3), (3, 4 ), (9, 4), (3, 5), (9, 5), (3, 6), (9, 6), (3, 7), (9, 7), (3, 8), 3D model in (9,8), (3,9), (4,9), (5,9), (6,9), (7,9), (8,9), (9,9) The number of slices at the highest point position of the cover 400 is 85, but the number of slices of the slice object cover of the slice image 403 at these coordinate positions is 72 (72 <85-5). Therefore, the processing unit 110 determines that the slice object covering of the slice image 403 at these coordinate positions is a non-printing area. As can be estimated by analogy, the other coordinate axis position of the slice object covering of the slice image 403 having the number of slices of 77 or less at the highest point position is a printing area (for example, 72 ≧ 77-5). Therefore, as shown by the slice image 403, the processing unit 110 sets a region surrounded by the contour 410c to the contour 430c (hatched region) as a printing region, and a region surrounded by the contour 430c to the contour 420c ( (Non-shaded area) is set as a non-printing area.

  Accordingly, referring to FIG. 6, according to the method for editing a 3D model cover according to the above-described embodiment, the processing unit 110 may print a 3D model cover printing region between the outer 3D contour 410 and the 3D reference contour 430. The 3D printing operation may be performed on the non-printing layer of the 3D model covering between the 3D reference contour 430 and the inner 3D contour 420, and the 3D printing operation is not performed.

  FIG. 8 is a flowchart showing a 3D printing method according to the embodiment of the present invention. Referring to FIGS. 1 and 8, the 3D printing method of the present embodiment is applied to at least the 3D printing apparatus 100 of FIG. In step S810, the processing unit 110 analyzes a plurality of slice objects of a plurality of slice images, draws a plurality of slice object covers according to individual contours of the slice objects, and each slice object cover is a slice object. Part. In step S820, the processing unit 110 deletes other portions of the slice object outside the slice object cover, and integrates the slice object cover of the slice image to obtain a 3D model cover. In step S830, the processing unit 110 analyzes the outer 3D contour of the 3D model cover, and acquires a plurality of slice numbers corresponding to a plurality of coordinate positions of the outer 3D contour on the reference plane. In step S840, the processing unit 110 determines the distance of the 3D model coverage from the outer 3D contour to the inner 3D contour in the vertical direction based on the number of slices corresponding to the coordinate position, and sets each slice object coverage of the slice image. change. Therefore, the 3D printing method of the present embodiment can acquire a smooth 3D model cover, perform a printing operation on the edited 3D model cover, and print a 3D object with a high-quality hollow effect.

  Also, for relevant slice object analysis, editing methods, and related device features, sufficient instructions and advice can be obtained from the embodiment of FIGS. 1-7C, and their detailed description will not be repeated. .

  In summary, the 3D printing apparatus and 3D printing method of the present invention is applied to applications that accurately change the thickness of the 3D model coating in the horizontal and vertical directions, reducing the imbalance of the inner 3D contour of the 3D model. Therefore, the 3D printing apparatus and 3D printing method of the present invention is applied to the use of obtaining a smooth 3D model coating and printing 3D objects having a high quality hollow effect.

  It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present invention without departing from the scope or spirit of the invention. Accordingly, the present invention includes modifications and variations of this invention as long as they fall within the scope of the appended claims and their equivalents.

  The 3D object printing apparatus provided in the embodiment of the present invention is applied to print 3D objects having hollow characteristics and 3D objects having high quality hollow effects.

DESCRIPTION OF SYMBOLS 100 3D printing apparatus 110 Processing part 120 3D printing part 130 Storage part 200a, 200b, 200c, 200d, 200e, 300a, 300b, 401, 402, 403 Slice image 210, 220, 230, 240, 310, 320, 330, 340 , 410, 420, 430, 410a, 410b, 410c, 420b, 420c, 430a, 430b, 430c Outline 400 3D model coverage X, Y, Z coordinate axis S1 reference plane h distance S810, S820, S830, S840 steps

Claims (14)

A 3D printing method applied to a 3D printing apparatus, wherein the 3D printing apparatus slices a 3D model in a horizontal direction to obtain a plurality of slice images, edits the slice image, and edits the slice image. The 3D printing method is configured to perform a 3D printing operation according to
Analyzing a plurality of slice objects of the slice image and drawing a plurality of slice object coverings according to each contour of the slice object, each of the slice object coverings being composed of a portion of the slice object;
Erasing each other part of the slice object outside the slice object coverage, and integrating the slice object coverage of the slice image to obtain a 3D model coverage;
3D printing method characterized by the above-mentioned.   The 3D printing method according to claim 1, wherein the slice object covers each have the same predetermined thickness. further,
Analyzing the outer 3D contour of the 3D model covering to obtain a plurality of slice numbers corresponding to a plurality of coordinate positions of the outer 3D contour on a reference plane;
Determining the distance of the 3D model coverage from the outer 3D contour to the inner 3D contour in the vertical direction based on the number of slices corresponding to the coordinate position, and respectively changing the slice object coverage of the slice image;
The 3D printing method according to claim 1, wherein: Based on the number of slices corresponding to the coordinate position, in the vertical direction, determining the distance of the 3D model covering from the outer 3D contour to the inner 3D contour,
Determining a printing region of the 3D model coating according to a predetermined number of layers and changing the inner 3D contour of the 3D model coating;
The 3D printing method according to claim 3, wherein: Analyzing the slice object of the slice image to draw the slice object covering according to the individual contour of the slice object;
Draw a plurality of reference contours along the outside of each of the individual contours of the slice object,
Each drawing the slice object covering along the inside of each of the reference contours;
The 3D printing method according to claim 1, wherein:   The 3D printing method according to claim 1, wherein the contour is an outer layer contour or a hollow contour.   The 3D printing method according to claim 1, further comprising: drawing a support structure in each of the regions surrounded by the slice object covering. A 3D printing department;
The slice image is connected to the 3D printing unit, is configured to slice a 3D model in a horizontal direction to obtain a plurality of slice images, and to edit the slice image. The edited slice image is operated by operating the 3D printing unit. A processing unit for performing a 3D printing operation according to
A storage unit connected to the processing unit and configured to store the 3D model and a plurality of modules, and the processing unit executes the modules and performs the following operations:
Analyzing a plurality of slice objects of the slice image and drawing a plurality of slice object coverings according to each contour of the slice object, each of the slice object coverings being composed of a portion of the slice object;
Erasing each other part of the slice object outside the slice object coverage, and integrating the slice object coverage of the slice image to obtain a 3D model coverage;
3D printing apparatus characterized by the above.   The 3D printing apparatus according to claim 8, wherein the slice object covers each have the same predetermined thickness. The processing unit executes the module and performs the following operations:
Analyzing the outer 3D contour of the 3D model covering to obtain a plurality of slice numbers corresponding to a plurality of coordinate positions of the outer 3D contour on a reference plane;
Determining the distance of the 3D model coverage from the outer 3D contour to the inner 3D contour in the vertical direction based on the number of slices corresponding to the coordinate position, and respectively changing the slice object coverage of the slice image;
The 3D printing apparatus according to claim 8. Based on the number of slices corresponding to the coordinate position, the operation of determining the distance of the 3D model covering from the outer 3D contour to the inner 3D contour in the vertical direction is as follows:
Determining a printing region of the 3D model coating according to a predetermined number of layers and changing the inner 3D contour of the 3D model coating;
The 3D printing apparatus according to claim 10. Analyzing the slice object of the slice image and drawing the slice object covering according to the individual contour of the slice object comprises:
Draw a plurality of reference contours along the outside of each of the individual contours of the slice object,
Each drawing the slice object covering along the inside of each of the reference contours;
The 3D printing apparatus according to claim 8.   The 3D printing apparatus according to claim 8, wherein the contour is an outer layer contour or a hollow contour. The 3D printing apparatus according to claim 8, wherein the processing unit executes the module and further draws support structures in regions surrounded by the slice object covering.

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